Form for use in erecting tapered concrete chimneys



C. H. McGREGOR.

FORM FOR USE IN ERECTING TAPERED CONCRETE CHIMNEYS.

APPLICATION FILED )ULY 15.192l.

l ,435 A188, Patented Nov. 14, 1922;.

3 SHEETS-SHEET 2.

C. H. McGREGOR.

FORM FOR USE IN ERECTING TAPERED CONCRETE CHIMNEYS.

- I APPLICATION FILED JULY 15. I921. 1,435,488. Patented Nov 14, 1922;

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Patented Nov. 14, 192 2. I i

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Bentknown that l; Cop er-H. McGRncon, a cit zen of the. United: States, residing, at

Durango, in the county oi: La Plataiand Stateof- Colorado; have invented; certain 118W- and usefulImprovements in F orins for Use; in. Erecting Tapered Concrete. Ghimneys, of which the following is 1 21,.speificartionr, H I This-invention isv-a form for use in constructing reinforced concrete columns vor smoke stacks. which 1taper toward their upper. ends The objectlof the invention: is .to provide: a2 mechanism which may be shifted verticalllyasr the column orstack-rises andcontracted inl diameter so as to conforms, to

the-gradually: decreasing diameter of't'he columnor'stacka TheinVen-tion also seeks to provide: an apparatus 7in which. the pressure ofsthe green concrete or other' 1 plastic colnposition Will be -effectuallyaresist'ed: and also to providelmeans for readily moving the apparatusi-upwardly with respect .to the com;- pleted portion of the column or stack and supporting I itrupon-thecompleted portion 130 receive-end permitthe-pouring;of additional cemenfito fornian additional 'section or layer on the. structure: Thesestated; objects :and

othenobjectsgwhich will incidentally appear int, the course. 5 of. the following; description of:the:structure;.tmproceedt v tus 2.is.- a-esectional viewi-of the appara- Fig. 3 is a top plan View thereoi' j 4uis-awdetailfhorizontal section sh'owing.- the:slidablezconnection between adj acent' SBOtlOIlSwOfthGrfOIIIl or mold; Fig. 5--is: avdetail perspective-view oft -the grii'pper members ofthe 'j ack; I In 1 carryingout my invention,- I employ a; plurality OfFSBCtlOHSf-EQClI-i of Whichconsists of: a board: or plate offproper; dimensions .-.to sustains thexpressuresto which s it is subjected '1 in -.use'.:\ These sections: are conof. one

1521;? Serial m s s- 53. i

l at I their side; edges byfinterengaging slidablea members whereby relative vertical movement of the sections. willl be permitted but relativechoriz ontal l movement will be prevented the drawinglstthe reference numeraL 1f designatessectiOns which} are illustrated as being provided? with. feet 2 Wherebytheyg may beanchoredtoz the ground soas to stand firmly hile-;thellowestllayer of cement is being poured. These sections l have theirrside edges converging; slightly upwardly to conform to. theltaperiwhichiitis desired to impart to the: finishedlstack or other; structure: and 1 at their side, edges are equipped with track, members 3, which are extended outwardly from thesections, as

' indicated at 4:, and then carried away. from the edge-of the section; concentric therewithg as indicated at5, andrterniinated -innhook or, reentrant flange 6. Between each} two sections l 'glsprovide asection/Z ofsimilar I material: gand the sections? have their xside edges alsoslightly con-verging upwardly. To the l section 7', at: the-side edges. .thereotiyl; secure track} members 8: which i are constructed. with overha ngi n-gv reentra'nt flanges, or

hooks i 9 adapted to interengage -with the hooks fi, as shown clearlyinw-Fig, 4,1 sol that hileth'e seotionsflgmay slide verticallyiupon the sections :1 relative horizontal: movemen t or separation; of; the sectionsqwill be. prevented; l the-[sections 7. are. intendeditoTbe raisedtas; the. work of, constructionpro;-

gresses; and, inorder-thatthey may accommodate-lthe' decreasing: diameter of the" col-' umnl or the: structure, they arepreferably formed-z with vertical hinge "j oint's, indicated at. 10,, wher'ebythey; will: be permitted -to fold slightly: This folding of, thersectionfi Will cause a slightly eccentric surface Qto be Will; be so slightlasfnotcto-lbe noticeable and not to jaflectthe stability of the structure. Moreover, the said-sections may be :IIl-iQVGCl and smaller) sections substituted therefor as the height of the stacker column increases. It will; 1 of"v course, be: understood that the sections 1k and y7-lcooperate with; similar. seer ,tions to constitute a I mold Within which 1 the concrete is poured and tampedw The. secprodueedluponlthe. stack "or'colummbutnt tionsvl and {Z are shown as set to-produce th eexterior surface of-the colu-m n, while cooperating sections, designated by the nu.- merals -11 and l 12, are disposed 1 at the inner sides; of thefirst described sections fconcen- I trici therewith, as shown clearly in. 3. g

The sections 12 arealso provided with hinge joints so that they may buckle inwardly as the internal diameter of the column decreases. It will be readily understood that I initially all the sections rest at their lower ends upon the ground and they are held in.

this position against collapse by suitable means which will be presently described. Concrete or other plastic material is poured into the space between the two circular series of sections and is tamped down in theusual manner. After this first layer or course has set, the sections 7 are moved upwardly and caused to engage a second set of sections 13 corresponding to the sections 1 but having their lower ends of the same dimension or extent as the upper ends of the sections 1. As the sections 7 are raised, the engagement of the track members at the adjacent ends of the sections will cause the sections 7 to approach each other in a horizontal plane and thereby contract to a degree corresponding and to the inner face of the inner mating section'12. 7 These standards are connected immediately above the sections by a cross bar or brace 15 and at their upper ends are connected by a bracing head 16. The concrete is reinforced in the usual or any preferred manner by metallic reinforcements embedded therein as the pouring proceeds, and I also provide smooth vertical rods 17 between the mating standards 14 which extend to a considerable height. These vertically disposed rods 17 are so located as to pass through the heads 16 connecting' the standards 14: and they, therefore, constitute guides or posts upon which the jacks consisting of the standards 1& and their connections may be mounted to operate when the sections are tobe raised. An exteriorly threaded sleeve or jack screw 18 is fitted around the rod 17 and extends through the head 16, a nut or collar 19 being secured to the headand engaged by the jack screw passing therethrough. The lower end of the jack screw is'swiveled in a gripper body 20 having seats 21 on its under side in which are fitted grippers or dogs 22 having recesses 23 in their edges to engage the rod 17 between them and these recesses are preferably corrugated, as indicated at 24, to more firmly bind upon the rod. The jack screw has a reduced angular terminal 81 at its upper end upon which is fitted a head 82 provided,

thereon by the concrete.

memes in its edge, with sockets 83 to he engaged by any convenient form of lever. To raise the form sections, the screw is rotated, the dogs 22 being locked to the rod 17 so that the turning of the screw through its engage ment with the nut or collar 19 will cause the yoke frame 14, 15, 16, to ride upwardly until the -member 16 touches the head 82 whereupon the direction of rotation of the screw is reversed, releasing the dogs and causing the screw to rideupwardly upon the rod 17 until the gripper body 20 strikes the nut or collar 19.

Secured to the several standards and extending laterally therefrom are arms 25 which support the rings or annular bands 26, it being noted that these lateral supporting arms and the annular bands are duplicated near the upper and lower ends of the sections. They are also duplicated at the inner side of the sections and upon the outer circumference of the inner band of each pair of bands is a rack 27, a. rack 28 being provided upon the inner face-of the outer cooperating band, as clearly shown in Fig. 3. Rotatably fitted in the supporting arms 25 between the co-operating annular-bands is a shaft 29 equipped with pinions30 which 'mesh with the respectively adjacent racks 27 and 28, as shown in Figs. 2 and 3. Each of these annular bands carries upon that peripheral face which it presents to the adjacent form section a wedge or block 31 adapted to bear against a mating block 32 on the section and it willnow be readily noted that if the shaft 29 be rotated in the'direction indicated by the arrow in Fig. 3, the bands co-operating therewith will be caused to move in opposite directions and the reversely disposed presser blocks or cams carried thereby will be caused to ride over the inclined faces of the blocks 32 on the sections and the sections will be thereby pressed firmly into the desired position and'held in that position against the pressure exerted The wedges or blocks carried by the inner sections and the inner annular bands are arranged reversely to those upon the outer'sections and the I outer bands to permit the inner sectionsfto contract as the form "is carried upwardly and in this manner I accommodate both the inner pered structures and it has been necessary to employ scaffolding and forms extending the entire height of the chimney and to construct difierent sets of'forms as the work progressed. My invention, however, provides a simple, easily operated and inexpensive apparatus which may be shiftedupwardly as the structure rises and will, eliminate a large number of forms now deemed necessary and result in avast saving of time and labor-so that the cost of erection will be reduced. v v

Having thus described the invention, what is claimed as new is:

members secured to the side edges of the several sections and formed with interengaging reentrant flanges whereby relative;

vertical sliding movement of the sections will be permitted but relative horizontal movement will be prevented, means for preventing collapse of the sections, and means for raising some of the sections while retaining their engagement with the adjoining sections.

3. An apparatus for the purpose set forth comprising a plurality of sections having slidable interlocking engagement at their side edges, said edges converging upwardly, jacks secured to and rising from some of whereby to lift the sections to which the jacks are secured while retaining the en gagement of said sections withtheadjoining I tions having their side edgesconverging up wardly and havinginterlockingsliding engagement at, said edges, means ,whereby some of the sections may beraised while retaining their engagement with theadjoining [45 sections, andmeans carried by said raising and cooperating I wedges carried by the the sections, and means carried by saidljacks f i' to engage a rod rising between said-section's sections.

4. In an apparatus for the purpose set fort-h, thecombination of a plurality of secmeans forvpreventing collapse of the sec t' sand permitting them t vh g t c v ward movement as they are raised.

'5. In an apparatus for "the purpose set forth, the combination of a plurality-of sections arranged concentrically andiforming inner and outer circles, some of the sections being slidable upon, the adjoining section means for eifecting Vertical; movementbf,

said slidable sections, supporting arms pros jecting laterally from 1 the last-mentioned it means, annular bands carried' by said sup porting arms, means for moving the ,adja cent annular bands in oppos te .;d1I6Ctl0I1 S,'-

bands andthe sections respectively. 1

In testimon COL NH MQGREGO whereof-I afiix mg sign t e- I l p Mas I v 

